Determination of the Corrosion Rate of Steel Bars in Concrete Based on the Porosity of Interfacial Zone

Zheng, Xin; Yang, Sen; Sun, Shuang

doi:10.3389/fmats.2020.573193

Cited by 4 publications

(1 citation statement)

References 32 publications

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“…Reinforced concrete structures are widely used in global construction industry due to their high mechanical performance, however the corrosion of the reinforcements by aggressive environments lead to deterioration, spalling, loss of integrity, and eventual catastrophic failure (Bazant, 1979;Sánchez-Deza et al, 2018;Zheng et al, 2020). The alkaline concrete environment favors the development of a stable passive film, which impart protection to the reinforcement surface (Macdonald et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Oxygen scavenging activity of smart colophony microcapsules containing nitrite corrosion inhibitors for steel reinforced concrete

2022

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In this study, the electrochemical performance of microcapsules (MCs) containing NaNO2 corrosion inhibitors for steel reinforcements was studied in 0.6 M chloride contaminated simulated concrete pore solutions (SCPS) with varying pH for a period of 28 days. The corrosion inhibition was studied by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The polarization results for the MC samples showed improved corrosion resistance, with an icorr of 2.54 ×10–6 A/cm2 after 28 days exposure in SCPS. Oxygen scavenging activity from the MCs was observed by reduced cathodic kinetics, displaying decreased cathodic exchange current densities of 2.66 ×10−8 A/cm2, thus imparting cathodic inhibition in conjunction with anodic corrosion inhibitors. The microcapsules additionally displayed improvement over free NaNO2 inhibitors after sufficient release time. The decrease in cathodic and anodic kinetics, along with the improved corrosion resistance, show a dual synergistic corrosion inhibition of the NaNO2 loaded colophony MC.

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Section: Introductionmentioning

confidence: 99%

Oxygen scavenging activity of smart colophony microcapsules containing nitrite corrosion inhibitors for steel reinforced concrete

2022

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Relation between resistivity of concrete and corrosion rate of reinforcing bars caused by galvanic cells in the presence of chloride

Shevtsov

Зарцын

Komarova

2021

Cement and Concrete Composites

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Physical, Mechanical and Transfer Properties at the Steel-Concrete Interface: A Review

2023

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The steel-concrete interface (SCI) is extensively acknowledged to affect the durability of reinforced concrete. The main objective of this paper is to conduct a state-of-the-art review that contributes to sufficient knowledge on the determination of the SCI properties and its effect on the overall performance of reinforced concrete elements. The physical characteristics at the SCI are influenced by segregation, flow, hydration, and drying shrinkage of concrete, hence affecting the presence of voids and cracks within this interface. The bond strength is one of the measures of the SCI and this is conducted through pull-out, push-in, and tie-beam testing. It was shown that the rebar shape and diameter, the anchorage length, the concrete grade strength, binder type (geopolymer concrete), and the distribution of aggregates have a significant effect on the interface properties and behavior, where geopolymer concrete offered improved bond behavior over conventional concrete. Various studies have demonstrated that the presence of the steel-concrete interface and the application of mechanical stresses contribute to the flow transfer (inflow/outflow) through the reinforced concrete structure. Some of these studies focused on the initial state of the SCI within the structure, and some conducted tests with shear loading on the SCI. Regarding the transfer properties at the SCI, it was shown that the presence of steel rebar, crack dimensions, degree of saturation of concrete, and the concrete mix design, influence the permeability of the concrete, specifically at the vicinity of the SCI, because of the development of micro-cracks at the interface. In other studies, the shear stresses were also found to affect the transfer properties through the SCI. Researchers have implemented several software solutions such as finite element models on ABAQUS and mesoscale numerical simulations and have used machine learning models that predict and verify the effects of bond failure behavior at the SCI. Good agreement was established between the numerical and actual experimental results. The influence of different exposure conditions on the steel-concrete interface that change throughout time needs to be dealt with, which includes moisture-related environmental conditions, variation in temperature, and chemical exposure. Furthermore, the influence of structural loading, such as “creep effect”, deterioration (ageing) of material must be studied at the interface. The studies were limited to short-term behavior.

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Determination of the Corrosion Rate of Steel Bars in Concrete Based on the Porosity of Interfacial Zone

Cited by 4 publications

References 32 publications

Oxygen scavenging activity of smart colophony microcapsules containing nitrite corrosion inhibitors for steel reinforced concrete

Oxygen scavenging activity of smart colophony microcapsules containing nitrite corrosion inhibitors for steel reinforced concrete

Relation between resistivity of concrete and corrosion rate of reinforcing bars caused by galvanic cells in the presence of chloride

Physical, Mechanical and Transfer Properties at the Steel-Concrete Interface: A Review

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